CSEMP assessment of lead in biota at New Brighton (Mersey)
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 30.44 | 33.44 | -12.22 | 24.44 | | | |
| linear | 2 | 24.34 | 30.74 | -8.17 | 16.34 | 8.102 | 1 | 0.0044 |
| smooth (df = 2) | 3 | 26.33 | 38.83 | -8.17 | 16.33 | 0.001 | 1 | 0.9764 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2002 | 2017 | 7.394 | 6.306 | -1.0878 | 0.2996 | -3.631 | 0.0084 |
| last 20 years | 2002 | 2017 | 7.394 | 6.306 | -1.0878 | 0.2996 | -3.631 | 0.0084 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 548.0 | 211.9 | -0.9501 | 0.1753 | -5.421 | 0.9995 |
| EC | 548.0 | 1500.0 | 1.0070 | 0.1753 | 5.746 | 0.0004 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Metals data
Metals assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for metals in biota
- Accessment criteria for metals in biota
